I feel like this has to have happened to me at least once, but I can't recall a single specific instance–probably traumatic suppression! What happens more often to me, as well as to my wife, is non-tickle friends or family innocently bringing up the topic of tickling. Sometimes it's fine, but occasionally the conversation gets stuck there for a while and we find ourselves getting irrationally angry or frustrated (internal feelings, not outward expression). I'm thinking "look, I didn't ask for this! How am I supposed to function right now?"